Question

Race-around condition is avoided by

• A. J-K flip flop
• B. D Type flip flop
• C. T Type flip flop
• D. Master clocked SR flip flop

Answer 1

The correct option is D Master clocked SR flip flop

Race-around condition is avoided by master clocked SR flip flop.

When the S and R inputs of an SR flip flop is at logical 1 and then the input is changed to any other condition, then the output becomes unpredictable and this is called the race around condition.

If the clock on or high time is less than the propagation delay of the flip flop then racing can be avoided. This is done by using edge triggering rather than level triggering. If the flip flop is made to toggle over one clock period then racing can be avoided.